/Engine/Source/Runtime/Engine/Classes/Materials/MaterialInstanceConstant.h
Set the parent of this material instance. This function may only be called in the Editor! WARNING: You MUST call PostEditChange afterwards to propagate changes to other materials in the chain!
void SetParentEditorOnly ( class [UMaterialInterface](API\Runtime\Engine\Materials\UMaterialInterface) * NewParent, bool RecacheShader )